Oven



April 15, 1952 C, C, WHITE 2,593,233

OVEN

Filed June 28, 1945 4 Sheets-Sheet l A T TORNEK April 15, 1952 c. c. WHITE 2,593,233

OVEN

Filed June 28, 1945 4 Sheets-Sheet 3 IN V EN TOR.

Char/f5 C. W/7//c A TTORNEK C. C. WHITE April 15, 1952 OVEN 4 Sheets-Sheet 4 Filed June 28, 1945 C WmF-ulwnlwwwwnlwuwm ,l Lmwwww@Www-wwwwwwwwwwwwwwwwhww nmhhkhllllll u ATTORNEY Patented Apr. 15, 1952 OVEN Charles C. White, New York, N. Y., assignor to White Cabinet Corporation, New York, N. Y., a corporation of New York Application June 28, 1945, Serial No. 602,049

9 Claims.

This invention relates to insulated cabinet constructions and particularly to those employed as ovens, broilers and the like. Certain features of this invention are, however, usable in the refrigerator field, and other features could be employed in cabinet constructions generally, as will be obvious from a consideration of the construction and utility of those features themselves. Accordingly, though I will describe my invention as in the eld of ovens and broilers, it is to be readily understood that the -applicability of some of the features thereof is not so limited.

Though the outward appearance of ovens and cooking stoves has been improved somewhat of late, little has been done to introduce improvements into and remove impediments from their utilization with the result that the housewife and the chef have to surmount obstacles in their cooking operations which should have been eliminated long ago. As examples of such obstacles, I refer to such things as hinging of the doors on ovens which still cause the doors to swing out and get in the way, particularly so where, in accordance with common practice, the hinging is across the bottom. Another detriment of ovens as heretofore devised is the necessity of sliding shelves or trays in and out of them when it is desired to test the food being cooked, vary its position with respect to the burners, baste a roast, or remove the food from the oven when it is cooked. At the best, such procedures are cumbersome when prior art ovens are employed. They are further complicated by the additional precautions that need to be taken once the oven has been warmed up and the trays or shelves, as well as the foods on them, become hot. Moreover, the general construction of domestic ovens, which normally form the lower part of cooking stoves, has, in the past, been such that it was impractical to mount them anywhere but on the floor. This caused the housewife to be everlastingly bending over and working from a tiresome and awkward position while using the oven. Basic drawbacks such as these in oven and stove construction have persisted right along, while any improvements that have been made have been largely limited to exterior appearance, accessories and the like, without any material improvement in thebasic construction or utility.

The oven of my invention not only eliminates the prior art defects but also introduces improvements which carry it well beyond the realm of prior practices. In the rst place, the oven of my invention may be made in a wide range of sizes, but, it is nevertheless so designed and is of such light weight that it may be incorporated at any desired position in a cabinet assembly as illustrated in my co-pending application entitled Cabinet Assemblies, Serial No. 593.411, filed May 12, 1945, now Patent 2,521,765 September 12, 1950. This enables the housewife or other user to have the oven located at his or her proper working level. Here the locating of the oven does not depend upon legs, kick board or the like, to mount it on the floor. Furthermore the oven does not have to carry the grids or grates, of customary cooking stoves, on top of it. Such grids or grates may be mounted elsewhere in the assembly if desired.

Though of light weight, the oven of my invention isfully insulated throughout and will not noticeably heat up any surrounding cabinets. It is constructed to operate with a minimum expenditure of heat energy no matter how the same be provided.

My oven may, of course, be employed. as an independent unit, separate and apart from any other cabinets or equipment in the kitchen, and obviously it may have the grids or grates of a range mounted on top of it to form a complete kitchen stove. Also the various improved features of my oven may be incorporated in more conventional ovens and stoves without removing such features from the spirit and scope of my invention. Finally, the marked advantages of the operable features of my oven and stove over conventional oven and stove constructions are just as noticeable whether the oven be mounted in conventional position just off the floor, or, in some preferably raised position, as part of a cabinet assembly.

The door of my oven, though fully insulated, is rotatable from closed to open position with the exertion of a minimum of eifort. Such opening and closing may be accomplished by grasping the door, or a fitting on it, directly or by actuating the remote means provided. Normally the outside of the door or the fitting on it would remain cool enough to handle, but I have provided remote means if the .door heats up too much. Such remote means, being located adjacent thetop of the oven, is particularly advantageous when the oven is mounted down low, for it permits opening of the door without stooping over. The mounting of the door of my oven is such that no catches or the like are needed to hold it in closed or open position. It is merely swung to desired position and stays there. Thus all the tugging and slamming required to open and close the doors of prior art ovens is ellixkninated` Another marked improvement in ovens introduced by my invention concerns the mounting and operation of the intermediate shelf or tray used for supporting food to be cooked. Here again, the mere turning of a member extending outside of and near the top of the oven enables the user to either raise the tray, lower it, or project it out of the opening once the oven door has been opened. Here again. even though the oven be mounted down low, little or no bending or stooping is required to manipulate it or the food being cooked in it. In addition, the shelf or tray is rotatably mounted on its support which introduces further advantages for the user.

My invention incorporates many other im'- provements over prior art practices. Their presence will become apparent as the detailed description proceeds, and in the interests of brevity they will not be related here.

It is accordingly an object of my invention to provide an oven or the like whose operation and utilization are greatly simplified.

It is another object of my invention to provide an oven or the like which simplifies the work of the user and protects the user against injury or accident.

It is another object of my invention to provide an oven or the like which may be mounted and employed in any desired location.

Other objects of my invention concern the provision of an oven or the like which is light inweight, complete in its capabilities and simple and improved in operation.

Still other objects of my invention concern the construction of oven doors and gasketing for the same.

More 'specific objects of the invention concern the simple operation of oven doors, and simplification of adjustment, introduction and removal of the food supports for ovens.

Other and more specific objects of the `invention will appear as the description proceeds and by reference to the accompanying drawing in which:

Figure 1 is a vertical section through an oven in accordance with my invention taken on lines I--I of Figure 2 and folded back slightly to enhance the illustration.

Figure 2 is a horizontal section taken on the line v2-2 of Figure 1 and looking in the direction Figure 6 is a perspective view partly in section showing the door with its mounting and gasketing.

Figure 7 is a fragmentary vertical section'` taken von lines 'I--l of Figure 6 looking in the direction of the arrows.

Figure 8 is a perspective view of the housing for the bevelled gears for operating the door.

Fig. 9 is a plan view of the oven showing the intermediate shelf or tray thereof in outwardly extended position.

Figure l is a perspective view of the intermediate shelf support and adjustable mounting therefor.

member I2.

Figure 11 is a Vfragmentary section of part of the wall of the oven showing the manner in which the adjustable shelf mounting member is carried thereon.

Figure l2 is a perspective view of the upper mounting plate for the adjustable shelf mounting member with part of that member engaged therewith.

Figure 13 is a perspective view of one of the stiener member employed at the ends of the door opening of the oven.

Fig. 14 is an enlarged fragmentary vertical section of part of the door and part of the top of the oven showing the horizontal gasketing for the door.

Figure 15 is a plan view of the operating mechanism for the door including the housing for mounting and protecting the bevelled gears.

Figure 16 is a plan view of the mating gaskets employed in pairs at the top and bottom of the door.

Figure 17 is a section taken on lines I'l-:II .of Figure 16 and looking in the direction of the arrows, and

Figure 18 is a section taken on lines IB-zI-S of Figure 16 4and looking in the direction of the arrows.

The oven of my invention Vhas a Vertical side wall shown generally at 5 which forms a substanportion of a cylinder but is -interrupted throughout part of its extent to provide .anopening giving access to the interior of the oven, as described more fully hereinafter. The oven is closed at its top and bottom by disc-like members, shown generally at-' and which Ait within and are secured to the cylindrical side portion 5.

The side portion 5 is of double walled construction having an outer wall -t and an inner wall lli, preferably made of lightweight metal. The space between such walls is filled with suitable insulating material I. Similarly the top member 6 has an outer wall I I and an inner wall I2, which are spaced apart by Athe upturned flanged edge I3 formed around the inner wall The space between the walls II and I-2 is filled with insulating material shown at I4. The bottom member l as shown has, similarly, an outer wall I5, an inner wall I6, a spacing-'ilange Il extending from and around the inner wall, and insulation I 8 between the two walls. The inner wall It may, if desired, have theV major portion'of its surface depressed downwardly into shallow pan-like form to catchany drip from the cooking and thus expedite cleaning.

The outer walls I I and I5 of the end members 5 and terminate in reversely bent flanged rims which are generally U-shaped in cross-section and extend inward with respect to the body of the oven. The .inner side walls I9 and i2!! of these U-shaped rims overlie the fianges I3 and 'i but are spaced therefrom to sucien't extent to permit the interposition therebetween of the inner Wall member '9 of the side portion 5. For an enlarged showing of `this detail, reference is made to Figure 11. VThewalls I9 and 2l) are held in place with respect to the flanges I3 and I 1 and hold the member 9 therebetween by means of self-tapping screws or comparable fastenings At the top of the cabinet these screws are designated by the reference character 2'I and at the bottom of the cabinet by the reference character 22.

vThe side'portion 5 terminates at vertically extending ends generally indicated a`t 23 and 24, Figures 2, 4 and 5, between which a considerable amazes 'space is left in order to provide a substantial opening for the oven. The detail of these ends is best shown in Figures 4 and 5 from which it is apparent that at the end 23 the inner wall member 9 terminates in a laterally outwardly extending spacing flange 26 Which serves in part to maintain the proper spacing of the wall members 3 and 9. At this position the outer wall member 8 and the whole of the oven construction is reinforced and stiffened by means of a vertical stiffener member shown by itself in Figure 13. This stiffener member consists of a body portion 21 with lugs 28 and 29 extending inwardly adjacent the upper and lower ends thereof respectively. This stiffener member is, substantially the same as, and performs the same function as, the similar members discussed in detail in my co-pending application entitled Cabinet Structures, Serial No. 583,370, filed March 17, 1945. Reference to the member here is merely to explain its particular applicability to the structure of my oven.

Reverting to Figure l, it will be seen that the lugs 28 and 29 of the stiffener member 21 extend through the outer wall member 8 and underlie the bases 39 and 3|, respectively, of the channels formed around the walls and |5 of the top and bottom of the oven. Thus screws passed through bases 3D and 3| can be engaged with appropriate openings in the lugs 28 and 29.

The manner in which this aids in holding the whole construction together and giving it rigidity is also fully pointed out in my co-pending application just referred to. Likewise that application may be referred to for more detailed f showing of the manner in which the edges of the outer wall member 8 seat and are secured in and by the turned-over bead at the termination of the channel members |9--3 and 26--3|.

Coming back to Figures 4 and 5, it will be seen that though the outer wall member 8 extends beyond the flange 26, the full width of the wall actually terminates at the flange 26 since a nishing member is secured in place at this position. This finishing member has a securing portion 33 which overlies the inside of the wall member 8 where the same is reinforcedby the stiffener member 21. The fastening of the portion 33 to the wall 8 by some suitable means, such as the rivet shown, also serves to secure these two members and the body 21 of the stifener member together. At the outer end of its securing portion 33 the nishing member extends directly laterally in a stop portion 34 which not only overlies the flange 26 and may be secured thereto in some suitable manner, but also extends inward beyond the inner surface of the wall member 9 to provide a stop for the door as will be more fully explained hereinafter. From the portion 34 the finishing member extends backwardly and outwardly in a portion 35 which includes several bends and terminates in an engaging portion 36 to enable this unit to be suitably engaged with an adjacent unit as fully set forth in my application entitled Cabinet Assemblies, Serial No. 593,411, led May 12, 1945.

The other end 24, (Figure 5) of the Wall 5, terminates generally in the same manner as does the end 23. At this position the inner Wall portion 9 is provided with a laterally extending terminating, spacingllange 31 comparable to the flange 25. Here also a finishing member is secured in place through its securing portion 38 from which it extends in the stop portion 39, overlying the flange 31. The portion 39, however, extends inwardly further than does the portion 34 at the other end, since it is intended to lie across part of the pathv of the door and engage the leading edge of the same as both a stop and as heat gasketing. Thus the portion 39 terminates in a returned bent end 40 which acts as the actual stop and from thence the finishing member extends outwardly through the portion 4|, to the engaging end 42.

The opening 25 can be closed by a door which, in this instance, is a section of a cylinder concentric with, but of sufficiently shorter radius to enable it to swing within, the cylindrical portion of the wall 5. This door, which is shown by itself in Figure 6, consists generally of' a mounting frame and a closing portion which are normally assembled together but in such a manner that the closing portion, should an explosion occur within the oven, would ily out in response to a reasonable pressure. The mounting frame, generally indicated at 43, has Vvertical side members 44 and 45 and arcuate top and bottom members 46 and 41 of a curvature concentric with that of the cylindrical wall 5.

The top member 46 has arms 48 and 48a extending inwardly from the ends thereof and arm 49 extending inwardly at approximately the center thereof to converge in a center hub 50 which receives an upstanding stud 5| whose upper end is furnished with a bevelled gear 52. The stud 5| is held in place in the hub by any suitable means such as a set screw or drift pin and the center of the stud 5| when assembled coincides with the center of the arc of portion 46. Such center is also the center line of the cylinder about which the wall 5 is formed. The bottom member 41 is similarly provided with inwardly extending arms shown at 53, 54 and 55 in Figure 2. These arms meet in and terminate at a pivotal hub shown at 56 in Figures 1 and 2.

The gasketing of the top and bottom of the door against heat loss is shown partly in Figure 6 but in more detail in Figures 7, 14, 16, 17 and 18. Inclined sections of annuli 51 and 58 are secured respectively to the top and bottom of the door. Similar annuli 86 and 8| are secured respectively to the inside of the top and bottom of the oven. The inclines on 89 and 8| are the reverse 0f those on 51 and 58 and the location of the respective annuli is such that the inclined faces thereof approach each other as the door is closed. They finally come together in fully engaged position, as shown in Figure 1d, when the door reaches fully closed position. Thus simple but effective positive means to prevent heat loss past the top and bottom of the door is provided.

The closing portion of the door, generally shown at 59, consists of inner and outer wall members 60 and 6| which are spaced. apart and retained in that position by the flanging of their edges at 62 and 63. This closing portion ts within, and is encompassed by, the members 44, 45, 46 and 41 of the mounting frame. It is a cylindrical section concentrically curved with respect to the members 46 and 41 but it is slightly inset from the outer edges thereof as shown at B4 and 65. Similarly it is inset with` respect to the end member 44 as shown at 66. This insetting furnishes a path within which the projecting portion 34 of the finishing member rides and provides a heat trap during the movement of the door. The shoulder 66 on the member 44 serves to engage the stop portion 34 of the finishing member when the door reaches fully closed position. This engagement not only stops the door inv its :closed position, as shown in Figure 4, but

also .acts las .a seal, `or ,gasketing vagainst loss vof heat Aat ythis end .of 'the door.

The construction at the other end rof the door is diierent. There the outer yface of the member 5I :and the front face of the rame member vl5 are fiiush. Thus .the ldoor can be opened back `even 4past the stop portion 34 should thesame be desired. The stopping and heat gasketing of the end `of the door iormedzby the frame `member 45 is accomplished by bringing the end face of the member i5 .into engagement with the stop shoulder 0. 'The parts of door and frame are so related that the member '45 engages the `shoulder id :at the same time that the shoulder 55 engages the member 3i. Since at this same point the pairs of inclined annular sections 5'I-8il and Bil-2li will have come together, the door is effectively heat sealed all around. Y As already mentioned, it is necessary in oven constructions, which may use gas as the heating medium, to render some part of the construction, commonly the door, capable of blowing out, or opening on being subjected to reasonable internal pressure. Thus should an explosion occur in the oven, `the gases resulting from the explosion can expand rather than be locked up and be so much more destructive. vIn conventional gas stoves this condition is 'ta-ken care of by closing the `customary hinged door Yagainst a iiat spring catch. The instant door construction precludes the use of any of the prior art safeguards so an entirely novel solution had to be worked out. My solution, as shown in Figure 6, calls for mounting the closing portionfof the door in the mounting frame therefor by pressure responsive means so that the closing portion can blow out if necessary.

The position of the specific means employed is shown in Figure -6 and the detail of its construction is more clearly pointed out in Figures 3 and 4. It is, in eiect, a pimple and. dimple type of connection wherein bores are provided in the members M and d5 to receive spring pressed balls 67 which are urged forward by springs 68 and retained against backing out by suitable means such as set screws 69. The end flanges 62 and l63 of the walls 6o and 6| are depressed at Vappropriate points 'I0 to mate with and receive the balls 6l. So long as the closing portion 59 nts properly within its frame, I have found that two of these engaging members on each vertical member i4 and 45 are suicient, though the number of them, their size and location may, of course, be varied as required. I believe it will be appreciated, however, that when these engaging members are properly selected with respect to holding power and are properly located, the closing portion of my door will properly perform its ordinary closing function but will readily blow out in its entirety and act as a pressure release in the event that an explosion should occur within the oven.

The mounting 4of the door within the oven and the operation of it when so mounted is simply and effectively provided for. Considering first the bottom hub 5d, it is noted that the same is .mounted on the Ymounting plate 7| by means of the upstanding collar i2 extending therefrom. The mounting of the top of the door is somewhat different, however, since not only the pivoting of the door but `also the actuating of it about its -pivots takes place through this mounting. Here kthe stud shaft 5I extends through a mounting `and reinforcing plate i5 secured to the inner wall member I2 at this position and thence through vthat Awail :I2 into a housing i4., Figures 8.and115, which :isolates afspace between the inner and outer walls I I and I2 to enable `the bevelled gears to work without "interference 4from `the insulation M. Actually, of course, the stud y'shaft 5I is let into this housing from above and is only secured in place in the hub 50 when the door is put in place in `the oven.

The housing I4 is vbored through its front face atV l5 to receive a shaft I6 on the inner end of which a bevelled gear I1 is .mounted ,insuch position :as to engage the bevelled gear 52. The shaft T6 extends out through the insulation for the top of the oven, as shown in Figure 9, to a point at the front of the oven just outside its periphery where it is furnished with a turning knob 'I-S. In as vmuch as the gears 52 and 1 I are of the samesiZe, it will be Aseen `that by merely turning the tknob 'I8 less than half a turn, the door `can easily be opened or closed without the necessity of touching any part of it directlyor any knob carried by it. With la properly constructed and mounted door, Athe turning by means of the lmob i8 can be accomplished 'without `any appreciable eiort by merely grasping the knob 71S between the thumb and the forenger and turning. Thus the housewife can open and close the oven door in eiortless fashion without any danger of being burned. If the oven is cold, however, its door canas easily 4be opened and :closed by using the iinger gr'ip, shown fat i9, in the face of the closing portion of the door.

The oven of my invention is designed to be heated either by .gas or electrically. Any suitable heaters of either type may be employed, the detail of which I do not 'believe it is necessary to set Vforth here. The manner -of mounting the heaters in the oven is, however, of importance and I have accordingly illustrated it by the showing of the housings for carrying the heaters. Thus the upper heater or .broiler is illustrated by the housing 82. This housing is held in place by means of a bolt 33 passed through the base of the housing, through the .securing and reinforcing `plate 'I3 and through the inner wall I2 where it is engaged with a nut as shown. A spacer collar SE carried on the shank of the bolt 83 spaces it Yfrom the plate I3 a sufficient distance to permit the opera-tion of the arms il?, 48 and 49 between the upper surface of the housing v82 and the lower .surface of the member 1,3. Finally it is to be noted that the :bolt 83 is placed around at aposition :beyond that :normally reached by the arm .di of the door when the door is swung around into fully open position.

The .bottom heater is carried in a housing 85. This housing overlies a drip pan 86 and both are carried by an extension T12-a of the member 'il past the collar l2. The shoulder at the end of the collar 12 supports the pan 86 out of the way of the .hub 55 .and the arms-53, 54 and 55. The extension 12a continues through and above the housing Y to receive a :supporting stud 81a of a revolving pan 81. This vpan 81 may Ybe used directly as a roasting pan vor may receive an additional pan thereon as desired. In either event the Afood being roasted can be rotated Vand the pan 81 may be removed if desired by merely lifting it up.

The remaining Vfeature of my invention to be described in detail concerns the manner of mounting, adjusting and employing the intermediate shelf or tray on which food may be supported for cooking. The shelf itself, indicated at 88, may either be in the form of a complete dish or may merely be a spider which carries a wire grid over it. As shown, however, such a wire grid 88a is placed on the shelf. With such construction food could be baked or meats broiled without the need of any additional pan since the shelf itself serves as a pan. The shelf is circular and is carried on a spider. The spider is provided with a pivotal stern 89 for recept-ion in the mounting opening 9|] adjacent one end of a supporting arm 9i. The opening 99 is surrounded on its top side by a bearing surface 92, Figure 10, Which takes the load off the shelf and distributes it over a reasonable area to facilitate turning. Since the stud 89 is merely seated in the opening 90, the shelf may not only be turned but may readily be removed by merely lifting it to disengage the stud from its receiving opening.

Though supporting arm 9i extends to substan-- tially the center of the oven to support the shelf, it is sufficiently rigid to furnish all the support for the shelf that is needed. The end of the arm 9i remote from the pivotal opening 99, is formed with a vertically elongated, interiorly-threaded collar 92. This collar is carried on a screwthreaded shaft in the nature of a jack screw 93 with the pitch of the mated threads being such that simple turning of the shaft 93, while the arm 9| is held in one position, enables the arm and the shelf carried by it to be raised or lowered as desired with a minimum of effort.

The shaft or screw 93 is mounted adjacent a side wall of the oven just inside ythe right-hand end of the opening therein by means of pivotal extensions 94 and 95 on its ends. The extensions 94 and 95 are received in suitable pivotal openings in blocks 96 and 9'! secured respectively to the inner walls of the bottom and top of the oven. At the upper end of the screw threads the shaft 93 is provided with a bevelled gear 98. This gear meshes with a gear 99 suitably secured on the end of a short shaft I 00, which, as best shown in Figures 3, and 9, extends out through the member 394L The shaft E00 is provided at its outer end with a suitable crank and a handle I0 i, to facilitate turning.

To operate the shelf mounting and adjusting device just described, let us assume that first it is desired to raise the shelf. This is accomplished by a clockwise turning of the shaft i90 which feeds the screw 93 into the collar 92 and raises this collar. First, however, the collar 92 will tend to turn about the screw 99 so that the shelf 88 will swing back until it engages the wall 9 near the back of the oven. The shelf can readily slide up along that wall as the screw is turned. To lower the shelf, the procedure is reversed, with the door being shut or partly shut so that the shelf 88 will rst swing against, and then slide down, the inside surface of the door. Obviously the shelf can be moved up adjacent the housing 82 for broiling, be lowered to an intermediate position for baking, or lowered all the way for roasting if it is not desired to use the pan 8T.

Finally, if it is desired to swing the shelf outside of the oven to place food on it, examine the food already on it, remove such contents or the entire shelf, or for any other reason, such can easily be accomplished. The door is merely opened all the way and the shaft |99 turned counter-clockwise. This results in the collar 92 being turned with the shaft 93 thus swinging the arm 9| and the shelf 89 out into the position shown in Figure 9. In this position the shelf may be rotated for examining or treating the food 10 being cooked thereon, or either or both of the food or shelf may be lifted up and removed if desired. It will be readily appreciated that mounting and operation of the shelf of my invention eliminates many defects, as well as much danger and awkwardness involved in the use of shelves previously furnished in ovens. These improvements along with the others above disclosed will go a long way toward easing the labor of the housewife and chef in so far as the use of ovens is concerned.

What I claim is: i

1. In structure for heating gasketing, an arcuate rotatable door, a housing carrying said door and formed with a door opening therein, engageable means on the door and on said housing adjacent said opening for gasketing the arcuate edge of said door against heat loss, said means including a member having a face curved eccentrically with respect to the curvature of the door and a member for engaging said face when said door is moved into closed position, one of said members being mounted on said door and the other of said members being mounted on said housing adjacent said opening.

2. In insulated housing construction, a vertical side wall consisting of portions of two coaxial cylinders, each of said side portions being less `than a complete cylinder and terminating in spaced apart vertical'edges, one of said portions being rotatable with respect to the other portion to cover and uncover the opening between the vertical edges of said other portion, said vertical side wall being provided with opposed ends, substantially identical members for closing said ends,

and mounting means seated on the inner surface of said closing members, said mounting means including means for rotatably mounting said one portion with respect to said other portion and including means for mounting a heating member within said Vertical side wall.

3. In oven construction, an enclosure formed by a side wall and end Walls, said side wall comprising portions of coaxial cylinders, radial members extending from the ends of one of said cylindrical portions to the axial line of said one por tion, means carried solely by the inner surfaces of said end walls for the pivotal mounting of said radial members, whereby said one cylindrical portion is rotatable with respect to the other of said cylindrical portions, and means carried by said pivotal mounting means for mounting a heating member within said enclosure intermediate said radial arms.

4. In construction of the character described, an insulated housing formed with an opening therein, a door for closing said opening, said door being formed with a pair of opposed arcuate edges, heat sealing gasket means for said edges, said gasket means including pairs of mated inclined arcuate members, one member of each pair being secured to an arcuate edge of said door and the other member of each pair being secured to an adjacent wall of said housing, and means for mounting said door for rotation to and from open and closed position, said pairs of inclined arcuate members coming together to form a heat seal as said door is rotated into closed position.

5. In structure of the character described, a housing formed with an opening therein, a door for closing said opening formed as a section of a cylinder having arcuate and straight edges, means for heat sealing the arcuate edges of said door, said means including pairs of mated gasket members formed with inclined mated faces, one memben of each pair being secured to' said` door andf the, other membervof` each pair being secured to. said housing,v said members of eaoh pair having .inclinedv faces. in opposed relation, means for mounting said door for rotation. about: the axis-,of its cylinder to bring said gasketmembers intoland outofu engagement as said door is closed and opened, and means to. engage. the straight edges; of said door as the same is brought into closed. position to` stop the same and gasket saidv edges against heat loss.

6. In oven construction, a housing. formed with an, opening, therein,l an. arcuate doorv member, meansy for mounting said door` member on said housing for rotation about the center of its arc SQCQVer and. uncover said opening and means for irl-matting rotation to said door memberv about said mounting, said rotation imparting means a rotatable member and means to mount said rotatable member for rotation. about a fixed. axis atan angle to the axis of rotation of said door member, interengaging motion transmitting means on said doorv and'. on said, rotatable. member for transmitting the rotation of said'. rotatable member toA said door, said rotatable member extending` from said housing, ata; position inspaced relation with respect tosaid door whereby said door may be rotated to open or close it without engaging it directly.

7,. In oven construction, a chamber formed with an opening in the wall' thereof, a door for closing said opening and mounting meansA for mounting s aidrdoor'on said' chamber for movement to cover anduncover' said opening, said door including a sinoprortingl frame,` a closing element` receivedv Within said frame andautomatically engageable and disengageable interengaging means on said frame; andA said closing element for securing the same together-but providingV for their automatic disengagement in response to pressure exertedupon said closing element.

8. In oven construction, a chamber formed with an opening in the wall thereof', a door-for closing said'opening and mounting means for the rotatabl'e mounting-of said door to coverA and uncover said opening, said door comprising a frame element formed" with vertical side members andarcuate end members, a cylindrical panelporti'on concentric with said arcuate end members and ment, and mea-ns on the inner faces of said mem-- means on the inner facesy of said members and on said panelportion for engagingv and resilientlf,r4

retaining said panel portion` and said frame. element togethenand means fonmounting said: door on said chamber forrrctatable movement about the axis of said arcuate end members to cover and. uncover said opening., said door mounting means including arms extending from said arcuate end members;

CHARLES C. WHITE.

REFERENCES CITED- The following references are of record in the le" of:V thisl patent:

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